1. Action of radioactivity and of pollution upon parameters of atmospheric electricity;Bricard,1965
2. Spectrometer for atmospheric ions in their uppermost range of mobility;Dolezalek;Final Report-Avco-RAD-TR-65-25,1965
3. Discussion on mobility of atmospheric ions;Dolezalek,1968
4. Über die Existenz electrischer Ionen in der Atmosphäre